I wanted to know if the ODK server (appspot.com) can hold up to how many gigabytes. So the data storage size can go up to how much in Gigabytes terms.
We have a form where at each interview the investigators will be required to send the photos of each structure or health facility surveyed.
Google App Engine support was dropped in Aggregate v2.x and you can read more about why in the documentation: https://docs.getodk.org/aggregate-app-engine-legacy/
The documentation includes information about dataset size when using Google App Engine.
Please note that Aggregate is no longer being updated. We highly recommend you explore using ODK Central instead.